U.S. President, Donald Trump has withdrawn his country's endorsement of the G7 communique after accusing host and Canada's Prime Minister of making false statements at a press conference at the conclusion of the event.

Trump and Trudeau have been ramping up insults ― with Trump characteristically going further than Trudeau ― as the two countries bicker over tariffs.

Mr Macron's office said France and other European Union countries would maintain their support for the final G7 communique.

New Italian Prime Minster Giuseppe Conte however opted to support Trump, tweeted approval of his suggestion by stating that, "Russia should re-enter the G8".

Trudeau told the president that Canadians did not take it lightly that the USA has moved forward with significant tariffs on their steel and aluminum industry.

Kudlow said Trudeau "stabbed us in the back" and "did a great disservice to the whole G7" with his "amateur political stunt".

Within minutes of the official release of the document, Trump attacked Trudeau on Twitter over what he described as the prime minister's "false statements" during the closing G7 news conference - and the president announced the US would no longer endorse the communique.

Kudlow also accused Trudeau of trying to undermine the USA president at a critical time before his summit with the reclusive Kim on Tuesday.

Looking for news you can trust? The non-factual part of this is - they have enormous tariffs.

Donald Trump and Justin Trudeau have been at loggerheads over trade tariffs

On Saturday, after negotiations with Trump and the U.S. president's departure from the G7 summit Trudeau said that the "US tariffs were kind of insulting" and that Canada "will not be pushed around".

"Trudeau, who stands at 6'2", appears at least an inch taller than Trump in a photo the Prime Minister shared from this weekend's G7 summit.

Kudlow said Kim must not see "American weakness" on the eve of the Tuesday summit. "The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President", the office added.

A New York Times reporter who was present at the Trudeau press conference tweeted Sunday that he didn't understand what remarks Kudlow was referring to when the economic adviser said Trudeau stabbed the U.S.in the back.

Mr Trudeau had told reporters that Mr Trump's decision to invoke national security to justify United States tariffs on steel and aluminum imports was "kind of insulting" to Canadian veterans who had stood by their USA allies in conflicts dating back to World War I.

The trade spat dominated the meeting, with Canadian and European leaders threatening retaliatory duties in response to the United States levies.

In a separate interview on CBS's "Face the Nation", Kudlow said the Trump had a "very successful, calm, friendly, respectful bilateral" with Trudeau and that the US won't withdraw from Nafta. Earlier this week, Merkel said the group is defined by its members' respect of global law, and Russia's 2014 annexation of Crimea was a "flagrant breach" of that.

The fight isn't just with Trudeau and Canada but with the best allies of the U.S., Democratic Senator Dianne Feinstein of California said on CNN.

A German government spokesman also said that Berlin stands by the jointly agreed G7 communique in which leaders underlined the crucial role of a rules-based worldwide trading system and promised to fight protectionism.

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